CN107147137B - Intelligent commutation control device and commutation control method - Google Patents
Intelligent commutation control device and commutation control method Download PDFInfo
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Abstract
The invention provides an intelligent phase change control device and a phase change control method.A processor receives three-phase voltage signals and current signals of a power distribution network transmitted by an analog input module, and calculates three-phase voltage, load current amplitude and phase by adopting a half-wave Fourier transform algorithm to realize measurement display and communication remote transmission functions; after receiving a phase change instruction sent by a platform area control terminal, judging voltage and current sampling waveforms in real time, and sending the phase change instruction to a control phase change control module to realize phase change action; after the phase change action is finished, uploading an operation result to the platform area control terminal through the carrier communication module; and the commutation control module is used for controlling the electronic commutation switch to execute commutation according to the commutation instruction sent by the processor. The intelligent seamless commutation technology is realized, the voltage and current phase zero crossing points are tracked in real time in the whole process from receiving a commutation instruction to completing commutation, the switching operation is short-time and reliable, and commutation lap joint is not ensured to occur.
Description
Technical Field
The invention relates to the field of power distribution networks, in particular to an intelligent phase change control device and a phase change control method.
Background
The power users in the power distribution network in China are numerous and distributed in positions, and a large amount of single-phase loads with unbalanced space-time distribution exist, so that the problem that three-phase loads with different degrees exist in most power distribution areas is solved. The loss of a distribution transformer and a load circuit is increased due to three-phase load unbalance, the voltage quality of a heavy-load phase in a distribution area is reduced, the output of the distribution transformer is reduced, the electric energy conversion efficiency is reduced, the zero-sequence current of the distribution transformer is increased due to three-phase unbalanced operation, and the caused eddy current loss increases the operation temperature of the distribution transformer, so that the safety and the service life of the transformer are endangered.
The basic principle of the existing phase change control system based on a distribution area control terminal is that the operation working condition of a distribution transformer is monitored in real time through an area management terminal, and under the condition that three-phase load imbalance is out of limit, the area control terminal selectively remotely controls a phase change switch of a terminal load in a communication mode, so that loads hung on a heavy-load phase are switched to a light-load phase, and the purpose of load balance is achieved. But has the following disadvantages: the conventional phase change switch is based on mechanical switching operation, and power supply is interrupted for a short time during switching, so that the conventional phase change switch cannot be accepted by power supply departments and users.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an intelligent commutation control device, which comprises: the device comprises an analog input module, an AD converter, a processor, a commutation control module, a carrier communication module and a power supply module for supplying power to internal elements of the intelligent commutation control device;
the analog input module is connected with the processor through an AD converter and is used for acquiring three-phase voltage signals and current signals of the power distribution network, and transmitting the voltage signals and the current signals to the processor after passing through the AD converter;
the phase-change control module is connected with the processor respectively and used for uploading a load current value and a three-phase state of the electronic phase-change switch to the transformer area control terminal and receiving a phase-change instruction of the transformer area control terminal;
the processor is used for receiving the three-phase voltage signals and the current signals of the power distribution network transmitted by the analog input module, calculating the three-phase voltage, the load current amplitude and the phase by adopting a half-wave Fourier transform algorithm, realizing the functions of measurement display and communication remote transmission and simultaneously realizing the functions of overvoltage, undervoltage and overcurrent protection; after receiving a phase change instruction sent by a platform area control terminal, judging voltage and current sampling waveforms in real time, and sending the phase change instruction to a control phase change control module to realize phase change action; after the phase change action is finished, uploading an operation result to the platform area control terminal through the carrier communication module;
and the commutation control module is used for controlling the electronic commutation switch to execute commutation according to the commutation instruction sent by the processor.
Preferably, the analog input module includes: the circuit comprises a voltage input circuit, a current input circuit, a signal amplification circuit and a low-pass filter circuit;
the voltage input circuit is used for obtaining voltage signals of the power distribution network, the current input circuit is used for obtaining current signals of the power distribution network, the signal amplification circuit is used for carrying out operational amplification on the obtained voltage signals and the obtained current signals, the low-pass filter circuit is used for filtering the operational voltage signals and the operational current signals, and the filtered signals are transmitted to the AD converter.
Preferably, the voltage input circuit includes: a first resistor R1, an overvoltage protection device FU, a first transformer T1;
the first end of the overvoltage protection device FU is connected with the first input end of the voltage input circuit, the second end of the overvoltage protection device FU is connected with the first end of the primary side of a first transformer T1 through a first resistor R1, and the second end of the primary side of a first transformer T1 is connected with the second input end of the voltage input circuit; a secondary side signal amplification circuit of the first transformer T1;
the current input circuit includes: a second resistor R2, a third resistor R3, a second transformer T2;
a first input end of the current input circuit is respectively connected with a first end of a second resistor R2, a first end of a primary side of a second transformer T2 and a first end of a third resistor R3; a second input end of the current input circuit is respectively connected with a second end of a second resistor R2 and a second end of the primary side of a second transformer T2; a second end of the third resistor R3 is connected with a first end of a secondary side of the second transformer T2 and a first output end of the current input circuit, and a second end of a secondary side of the second transformer T2 is connected with a second output end of the current input circuit;
the signal amplification circuit includes: a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2 and an eleventh operational amplifier U11;
the input end of the signal amplification circuit is respectively connected with the first end of a fourth resistor R4, the first end of a first capacitor C1, the second pin of an eleventh operational amplifier U11, the third pin of the eleventh operational amplifier U11 is grounded, the fourth pin of the eleventh operational amplifier U11 is grounded, the fifth pin of the eleventh operational amplifier U11 is connected with a power supply, the first pin of an eleventh operational amplifier U11 is respectively connected with the second end of the fourth resistor R4, the second end of the first capacitor C1 and the first end of a fifth resistor R5, the second end of the fifth resistor R5 is respectively connected with the first end of a second capacitor C2, the output end of the signal amplification circuit is connected, and the second end of the second capacitor C2 is grounded.
Preferably, the processor adopts an MCU chip, the MCU chip has high-efficiency digital signal processing capability and real-time control capability of a microprogrammed control unit, the working frequency of a kernel can reach 120MHz, a program space and a data space are separately addressed, parallel processing is supported, a FLASH, an RAM and abundant I/O modules with equivalent capacity are integrated in the chip, and the chip is provided with a plurality of timers with input capture;
the carrier communication module adopts an FSK modulation mode and a half-duplex mode to communicate with an asynchronous serial port of the processor, and the processor reads data transmitted and received by the asynchronous serial port by using a DMA mode to realize data interaction with the control terminal of the station area.
Preferably, the method further comprises the following steps: a plurality of LED work indicator lights;
the processor is also used for controlling the display content of the LED working indicator lamp according to the commutation instruction and updating the display state of the corresponding LED working indicator lamp; the processor performs self-checking operation in each preset cycle, and if the self-checking fails, an alarm instruction is sent out, and the intelligent commutation control device is locked.
Preferably, the commutation control module comprises: a commutation switch control circuit, an auxiliary power supply circuit;
the commutation switch control circuit is used for controlling the action of the electronic commutation switch; the auxiliary power supply circuit is used for providing excitation +24 power for the commutation control module, and comprises: an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, an inductor L, a diode D and a power chip U1;
the input end of the auxiliary power circuit is respectively connected with a first end of an eleventh resistor R11, a first end of a third capacitor C3, a sixth pin of a power chip U1, a second end of a third capacitor C3, a fourth pin of the power chip U1, a second end of a fourteenth resistor R14, a second end of a fourth capacitor C4, a second end of a fifth capacitor C5 is respectively connected with the ground, a second end of an eleventh resistor R11 is respectively connected with a seventh pin of the power chip U1, a first end of an inductor L and a first end of a twelfth resistor R12, a second end of a twelfth resistor R12 is connected with an eighth pin of the power chip U1, a second end of the inductor L is respectively connected with a pin of the power chip U1 and an anode of a diode D, a cathode of the diode D is respectively connected with a first end of a thirteenth resistor R13, a first end of the fourth capacitor C4, a first end of the fifth capacitor C5, an output end of the auxiliary power circuit is connected, a second pin of the power chip U1 is respectively connected with the ground, a third pin is connected with a sixth capacitor C46.
Preferably, the commutation switch control circuit includes: a second operational amplifier U2, a third operational amplifier U3, a fourth operational amplifier U4, a fifth operational amplifier U5, a first triode Q1, a second triode Q2, a sixth resistor R6 and a seventh resistor R7;
the SET pin of the commutation switch control circuit is respectively connected with a pin of a second operational amplifier U2 and a pin of a fifth operational amplifier U5, the second operational amplifier U2, the third operational amplifier U3, the fourth operational amplifier U4, the fifth operational amplifier U5, the third operational amplifier U2, the sixth resistor R6, the first triode Q1, the third operational amplifier U3, the third triode Q1, the OUT + of the commutation switch control circuit, the fifth operational amplifier U5, the collector of the second triode Q2, the OUT-triode of the commutation switch control circuit, the third operational U4, the first resistor Q356, the second resistor Q3573742, the second resistor Q6, the sixth resistor Q7, the emitting electrodes of the first triode Q1 and the second triode Q2 are respectively connected with a +24 power supply.
Preferably, the method further comprises the following steps: the terminal voltage measuring module of the electronic switching element contact;
and the terminal voltage measuring module of the electronic switching element contact is used for detecting the voltage before and after phase commutation of each phase in the electronic phase commutation switch and transmitting the detected voltage signal to the processor.
A commutation control method, the method comprising:
the intelligent commutation control device executes initialization operation after being powered on or reset, reads the edge signal of the frequency measurement square wave to calculate the real-time frequency, and synchronously adjusts the sampling interval; calculating three-phase voltage, load current amplitude and phase by adopting a half-wave Fourier transform algorithm, realizing measurement display and communication remote transmission functions, and simultaneously realizing overvoltage, undervoltage and overcurrent protection functions;
after receiving a phase change instruction sent by a transformer area control terminal, the intelligent phase change control device samples waveforms according to the voltage and current of the transformer area three-phase power,
judging a first zero crossing point of the current after receiving the commutation instruction through a timer arranged in the processor, pre-judging the occurrence time of a second zero crossing point according to the frequency, pre-sending a switching instruction by the intelligent commutation control device according to the inherent action time of the commutation switch, and instantaneously disconnecting the load when the current crosses the zero crossing point;
and after the phase change action is finished, the phase change result is uploaded through the carrier communication module.
Preferably, the initialization operation includes sample data initialization, communication data initialization, IO port initialization, AD sample initialization,
after the initialization operation, the method further comprises the following steps: the intelligent commutation control device carries out self-checking operation, reads a frequency measurement square wave edge signal after the self-checking is successful, and calculates the real-time frequency;
and the processor of the intelligent commutation control device runs self-checking operation in each preset cycle, and sends out an alarm instruction if the self-checking fails and locks the intelligent commutation switch.
According to the technical scheme, the invention has the following advantages:
the intelligent phase-change control device utilizes the carrier communication module to communicate with the platform area control terminal system, realizes the phase-change function according to the zero crossing point of the voltage and current sampling waveform after receiving the phase-change instruction transmitted by the intelligent phase-change control device, realizes the intelligent seamless phase-change technology, tracks the zero crossing point of the voltage and current phase in real time in the whole process from the phase-change instruction receiving to the phase-change completion, has short and reliable switching operation, and ensures that no phase-change lap joint occurs. Zero-crossing commutation control, full sine wave switching, no harmonic generation and no inrush current in switching are realized.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is an overall schematic diagram of an intelligent commutation control device;
FIG. 2 is a circuit diagram of a voltage input circuit;
FIG. 3 is a circuit diagram of a current input circuit;
FIG. 4 is a circuit diagram of a signal amplification circuit;
FIG. 5 is a circuit diagram of an auxiliary power supply circuit;
FIG. 6 is a circuit diagram of a phase change switch control circuit;
FIG. 7 is a flow chart of a commutation control method.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of protection of this patent.
The present embodiment provides an intelligent commutation control device, as shown in fig. 1, including: the device comprises an analog quantity input module 1, an AD converter 2, a processor 3, a commutation control module 4, a carrier communication module 5 and a power supply module 6 for supplying power to internal elements of the intelligent commutation control device;
the analog input module 1 is connected with the processor 3 through the AD converter 2, and the analog input module 1 is used for acquiring three-phase voltage signals and current signals of the power distribution network, transmitting the voltage signals and the current signals to the processor 3 after passing through the AD converter 2;
the phase change control module 4 is connected with the processor 3 through the carrier communication module 5, and the carrier communication module 5 is used for uploading a load current value and a three-phase state of a phase change switch to the transformer area control terminal and receiving a phase change instruction of the transformer area control terminal;
the processor 3 is used for receiving the three-phase voltage signals and the current signals of the power distribution network transmitted by the analog input module 1, calculating the three-phase voltage, the load current amplitude and the phase by adopting a half-wave Fourier transform algorithm, realizing the functions of measurement display and communication remote transmission, and simultaneously realizing the functions of overvoltage, undervoltage and overcurrent protection; after receiving a phase change instruction sent by a platform area control terminal, judging voltage and current sampling waveforms in real time, and sending the phase change instruction to a control phase change control module to realize phase change action; after the phase change action is finished, uploading an operation result to the platform area control terminal through the carrier communication module 5; the commutation control module 4 is used for controlling the electronic commutation switch to execute commutation according to the commutation instruction sent by the processor. The power supply module 6 provides the direct current 24V, +/-12V and 5V voltages required by the intelligent phase change control device.
In this embodiment, the analog input module 1 includes: the circuit comprises a voltage input circuit, a current input circuit, a signal amplification circuit and a low-pass filter circuit; the voltage input circuit is used for obtaining voltage signals of the power distribution network, the current input circuit is used for obtaining current signals of the power distribution network, the signal amplification circuit is used for carrying out operational amplification on the obtained voltage signals and the obtained current signals, the low-pass filter circuit is used for filtering the operational voltage signals and the operational current signals, and the filtered signals are transmitted to the AD converter.
As shown in fig. 2, the voltage input circuit includes: a first resistor R1, an overvoltage protection device FU, a first transformer T1; the first end of the overvoltage protection device FU is connected with the first input end of the voltage input circuit, the second end of the overvoltage protection device FU is connected with the first end of the primary side of a first transformer T1 through a first resistor R1, and the second end of the primary side of a first transformer T1 is connected with the second input end of the voltage input circuit; a secondary side signal amplification circuit of the first transformer T1;
as shown in fig. 3, the current input circuit includes: a second resistor R2, a third resistor R3, a second transformer T2; a first input end of the current input circuit is respectively connected with a first end of a second resistor R2, a first end of a primary side of a second transformer T2 and a first end of a third resistor R3; a second input end of the current input circuit is respectively connected with a second end of a second resistor R2 and a second end of the primary side of a second transformer T2; a second end of the third resistor R3 is connected with a first end of a secondary side of the second transformer T2 and a first output end of the current input circuit, and a second end of a secondary side of the second transformer T2 is connected with a second output end of the current input circuit;
as shown in fig. 4, the signal amplification circuit includes: a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2 and an eleventh operational amplifier U11; the input end of the signal amplification circuit is respectively connected with the first end of a fourth resistor R4, the first end of a first capacitor C1, the second pin of an eleventh operational amplifier U11, the third pin of the eleventh operational amplifier U11 is grounded, the fourth pin of the eleventh operational amplifier U11 is grounded, the fifth pin of the eleventh operational amplifier U11 is connected with a power supply, the first pin of an eleventh operational amplifier U11 is respectively connected with the second end of the fourth resistor R4, the second end of the first capacitor C1 and the first end of a fifth resistor R5, the second end of the fifth resistor R5 is respectively connected with the first end of a second capacitor C2, the output end of the signal amplification circuit is connected, and the second end of the second capacitor C2 is grounded.
In this embodiment, the processor 3 adopts an MCU chip, which has both high-efficiency digital signal processing capability and real-time control capability of a micro-program controller, a core operating frequency of 120MHz, separate addressing of a program space and a data space, parallel processing support, and a plurality of timers with input capture integrated in the chip, wherein the FLASH, RAM and abundant I/O modules have a considerable capacity; the carrier communication module adopts an FSK modulation mode and a half-duplex mode to communicate with an asynchronous serial port of the processor, and the processor reads data transmitted and received by the asynchronous serial port by using a DMA mode to realize data interaction with the control terminal of the station area.
In this embodiment, the intelligent commutation control device further includes: a plurality of LED work indicator lights; the processor 3 is further configured to control the display content of the LED working indicator according to the commutation instruction, and update the display state of the corresponding LED working indicator; the processor performs self-checking operation in each preset cycle, and if the self-checking fails, an alarm instruction is sent out, and the intelligent commutation control device is locked.
In this embodiment, as shown in fig. 5 and 6, the commutation control module 4 includes: a commutation switch control circuit, an auxiliary power supply circuit;
the commutation switch control circuit is used for controlling the action of the electronic commutation switch; the auxiliary power supply circuit is used for providing excitation +24 power for the commutation control module, and comprises: an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, an inductor L, a diode D and a power chip U1;
the input end of the auxiliary power circuit is respectively connected with a first end of an eleventh resistor R11, a first end of a third capacitor C3, a sixth pin of a power chip U1, a second end of a third capacitor C3, a fourth pin of the power chip U1, a second end of a fourteenth resistor R14, a second end of a fourth capacitor C4, a second end of a fifth capacitor C5 is respectively connected with the ground, a second end of an eleventh resistor R11 is respectively connected with a seventh pin of the power chip U1, a first end of an inductor L and a first end of a twelfth resistor R12, a second end of a twelfth resistor R12 is connected with an eighth pin of the power chip U1, a second end of the inductor L is respectively connected with a pin of the power chip U1 and an anode of a diode D, a cathode of the diode D is respectively connected with a first end of a thirteenth resistor R13, a first end of the fourth capacitor C4, a first end of the fifth capacitor C5, an output end of the auxiliary power circuit is connected, a second pin of the power chip U1 is respectively connected with the ground, a third pin is connected with a sixth capacitor C46.
The commutation switch control circuit includes: a second operational amplifier U2, a third operational amplifier U3, a fourth operational amplifier U4, a fifth operational amplifier U5, a first triode Q1, a second triode Q2, a sixth resistor R6 and a seventh resistor R7;
the SET pin of the commutation switch control circuit is respectively connected with a pin of a second operational amplifier U2 and a pin of a fifth operational amplifier U5, the second operational amplifier U2, the third operational amplifier U3, the fourth operational amplifier U4, the fifth operational amplifier U5, the third operational amplifier U2, the sixth resistor R6, the first triode Q1, the third operational amplifier U3, the third triode Q1, the OUT + of the commutation switch control circuit, the fifth operational amplifier U5, the collector of the second triode Q2, the OUT-triode of the commutation switch control circuit, the third operational U4, the first resistor Q356, the second resistor Q3573742, the second resistor Q6, the sixth resistor Q7, the emitting electrodes of the first triode Q1 and the second triode Q2 are respectively connected with a +24 power supply.
In this embodiment, the intelligent commutation control device further includes: the terminal voltage measuring module of the electronic switching element contact; and the terminal voltage measuring module of the electronic switching element contact is used for detecting the voltage before and after phase commutation of each phase in the electronic phase commutation switch and transmitting the detected voltage signal to the processor.
If the phase voltage value is normal, the load is completely cut off, if the phase voltage value is zero, the switching fails or the hardware loop is abnormal, and at the moment, the intelligent phase-changing control device automatically locks and does not execute the action of closing the target phase any more, so that the inter-phase short circuit is prevented. After the load is completely cut off, the intelligent commutation control device searches for the voltage zero crossing point of the target phase, and drives the electronic commutation switch in advance before the voltage zero crossing point, so that the electronic commutation switch is closed at the zero crossing moment to recover the line power supply. The whole switching response time is millisecond-level switching, so that a user and common electric equipment cannot feel the switching, and the power supply reliability is greatly improved.
The invention also provides a commutation control method, as shown in fig. 7, the method includes:
the intelligent commutation control device executes initialization operation after being powered on or reset, reads the edge signal of the frequency measurement square wave to calculate the real-time frequency, and synchronously adjusts the sampling interval; calculating three-phase voltage, load current amplitude and phase by adopting a half-wave Fourier transform algorithm, realizing measurement display and communication remote transmission functions, and simultaneously realizing overvoltage, undervoltage and overcurrent protection functions;
after receiving a phase change instruction sent by a transformer area control terminal, the intelligent phase change control device samples waveforms according to the voltage and current of the transformer area three-phase power,
judging a first zero crossing point of the current after receiving the commutation instruction through a timer arranged in the processor, pre-judging the occurrence time of a second zero crossing point according to the frequency, pre-sending a switching instruction by the intelligent commutation control device according to the inherent action time of the commutation switch, and instantaneously disconnecting the load when the current crosses the zero crossing point;
and after the phase change action is finished, the phase change result is uploaded through the carrier communication module.
The initialization operation includes sampling data initialization, communication data initialization, IO port initialization, AD sampling initialization,
after the initialization operation, the method further comprises the following steps: the intelligent commutation control device carries out self-checking operation, reads a frequency measurement square wave edge signal after the self-checking is successful, and calculates the real-time frequency;
and the processor of the intelligent commutation control device runs self-checking operation in each preset cycle, and sends out an alarm instruction if the self-checking fails and locks the intelligent commutation switch.
Specifically, the intelligent phase-change control device collects three-phase voltage and load current at an installation position when working normally, external voltage and current signals are converted into small voltage signals through corresponding mutual inductors, and the small voltage signals are subjected to low-pass filtering through a primary operational amplifier and then are accessed to AD for sampling. Considering the needs of Fourier algorithm and tracking to judge the zero crossing point, the sampling point number of each fundamental wave period must be fixed, because the fundamental wave frequency of the system is not necessarily fixed 50Hz, and usually has slight deviation, firstly modulating A phase voltage into square wave to be input into a timer of a processor, capturing rising edge by utilizing the counting function and the edge triggering interrupt function of the timer to track the frequency, and eliminating the calculation error caused by the fundamental frequency fluctuation.
The processor of the intelligent commutation control device adopts a high-performance MCU chip, has high-efficiency digital signal processing capability and real-time control capability of a micro-program controller, has the kernel working frequency of 120MHz, separately addresses a program space and a data space, supports parallel processing, integrates FLASH, RAM and abundant I/O modules with equivalent capacity in the chip, and has a plurality of timers with input capture, and the interrupt management function is strong. The carrier module adopts FSK modulation mode and half-duplex mode to communicate with asynchronous serial port of the processor, the processor reads data from the asynchronous serial port by using DMA mode to realize data interaction with the station management terminal
The invention adopts the electronic commutation switch element as the actuating mechanism of commutation operation, can switch on and off the circuit like the common electromagnetic relay, and has large bearing capacity. In order to prolong the service life of the electronic commutation switch, arcing protection of contacts of the electronic commutation switch needs to be eliminated as much as possible in application, and the specific method is to conduct at a zero voltage position and turn off at a zero current position, reduce the transient effect of the switch and reduce the impact on electric equipment of a user
In the invention, the auxiliary power supply circuit is used as an excitation voltage source of the commutation switch control circuit, an intelligent trigger circuit is arranged in the commutation switch control circuit, the GPIO port of the processor directly drives the SET pin for executing the commutation action, and similarly, the other GPIO port of the processor drives the RST pin for executing the reset operation. The intelligent phase-change control device performs hardware filtering on three-phase voltage and load current signals to eliminate all other harmonic signals except fundamental waves, and then integrates corresponding sine waves into square waves through a zero-crossing detection circuit, wherein the rising edge and the falling edge of the square waves are actual zero-crossing points. Because the electronic phase change switch has inherent action time, a turn-off command needs to be sent out in advance at a certain moment before the zero crossing point, so that the contact is ensured to act when the contact is close to the zero crossing point, and the adhesion effect of the arc discharge on the contact can be eliminated. The intelligent commutation control device judges the first zero crossing point of the load current after receiving the commutation command through the timer, can pre-judge the occurrence moment of the second zero crossing point according to the frequency at the moment, drives the GPIO port in advance according to the inherent action time of the electronic commutation switch, and instantly disconnects the load when the load current crosses the zero point. The intelligent commutation control device can record the time from the command to the successful breaking, and use the value to correct the inherent action time of the electronic switch, thus the next switching operation can be controlled more accurately. Then the intelligent phase-changing control device immediately judges the terminal voltage of the moving contact and the static contact of the electronic switch. The intelligent phase-changing control device judges that if the target phase voltage is a normal phase voltage value, the load is completely cut off, if the target phase voltage is zero, the switching may fail or the hardware loop is abnormal, and at the moment, the software is automatically locked to stop the action of closing the target phase, so that the inter-phase short circuit is avoided. After the load is completely cut off, the intelligent phase-change control device searches for the voltage zero crossing point of the target phase, and the method is the same as the method, the GPIO port is driven before the voltage zero crossing point, so that the electronic switch is closed at the zero crossing instant to recover the line power supply. The whole switching response time is millisecond-level switching, so that a user and common electric equipment cannot feel the switching, and the power supply reliability is greatly improved.
The intelligent commutation control device adopts a modularized packaging power supply, is dustproof, moistureproof and anti-oxidation, and is used for alternating current input. After the external input voltage passes through the anti-interference filter circuit, three groups of direct current voltages, namely +5V, + 12V and +24V, required by the device are output by utilizing the inversion principle, the three groups of voltages are all not grounded together, and a floating ground mode is adopted, so that the device is not connected with a shell. Wherein, +5V is the working power supply of microprocessor in the device, + 12V is the data acquisition system power supply, +24V is used for driving the electronic switch.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (2)
1. A commutation control method applied to an intelligent commutation control device, the intelligent commutation control device comprising: the device comprises an analog input module, an AD converter, a processor, a commutation control module, a carrier communication module and a power supply module for supplying power to internal elements of the intelligent commutation control device;
the analog input module is connected with the processor through an AD converter and is used for acquiring three-phase voltage signals and current signals of the power distribution network, and transmitting the voltage signals and the current signals to the processor after passing through the AD converter;
the phase change control module and the carrier communication module are respectively connected with the processor, and the carrier communication module is used for uploading a load current value and a three-phase state of the electronic phase change switch to the transformer area control terminal and receiving a phase change instruction of the transformer area control terminal;
the processor is used for receiving the three-phase voltage signals and the current signals of the power distribution network transmitted by the analog input module, calculating the three-phase voltage, the load current amplitude and the phase by adopting a half-wave Fourier transform algorithm, realizing the functions of measurement display and communication remote transmission and simultaneously realizing the functions of overvoltage, undervoltage and overcurrent protection; after receiving a phase change instruction sent by a platform area control terminal, judging voltage and current sampling waveforms in real time, and sending the phase change instruction to a control phase change control module to realize phase change action; after the phase change action is finished, uploading an operation result to the platform area control terminal through the carrier communication module;
the commutation control module is used for controlling the electronic commutation switch to execute commutation according to the commutation instruction sent by the processor;
the analog quantity input module comprises: the circuit comprises a voltage input circuit, a current input circuit, a signal amplification circuit and a low-pass filter circuit;
the voltage input circuit is used for acquiring a voltage signal of the power distribution network, the current input circuit is used for acquiring a current signal of the power distribution network, the signal amplification circuit is used for carrying out operational amplification on the acquired voltage signal and the acquired current signal, the low-pass filter circuit is used for filtering the operational amplified voltage signal and the operational amplified current signal, and the filtered signals are transmitted to the AD converter;
the voltage input circuit includes: a first resistor R1, an overvoltage protection device FU, a first transformer T1;
the first end of the overvoltage protection device FU is connected with the first input end of the voltage input circuit, the second end of the overvoltage protection device FU is connected with the first end of the primary side of a first transformer T1 through a first resistor R1, and the second end of the primary side of a first transformer T1 is connected with the second input end of the voltage input circuit; a secondary side signal amplification circuit of the first transformer T1;
the current input circuit includes: a second resistor R2, a third resistor R3, a second transformer T2;
a first input end of the current input circuit is respectively connected with a first end of a second resistor R2, a first end of a primary side of a second transformer T2 and a first end of a third resistor R3; a second input end of the current input circuit is respectively connected with a second end of a second resistor R2 and a second end of the primary side of a second transformer T2; a second end of the third resistor R3 is connected with a first end of a secondary side of the second transformer T2 and a first output end of the current input circuit, and a second end of a secondary side of the second transformer T2 is connected with a second output end of the current input circuit;
the signal amplification circuit includes: a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2 and an eleventh operational amplifier U11;
the input end of the signal amplification circuit is respectively connected with the first end of a fourth resistor R4, the first end of a first capacitor C1 and the second pin of an eleventh operational amplifier U11, the third pin of the eleventh operational amplifier U11 is grounded, the fourth pin of the eleventh operational amplifier U11 is grounded, the fifth pin of the eleventh operational amplifier U11 is connected with a power supply, the first pin of the eleventh operational amplifier U11 is respectively connected with the second end of the fourth resistor R4, the second end of the first capacitor C1 and the first end of a fifth resistor R5, the second end of the fifth resistor R5 is respectively connected with the first end of a second capacitor C2 and the output end of the signal amplification circuit, and the second end of the second capacitor C2 is grounded; the processor adopts an MCU chip, the MCU chip has high-efficiency digital signal processing capability and real-time control capability of the microprogrammed control unit, the working frequency of a kernel can reach 120MHz, a program space and a data space are separately addressed, parallel processing is supported, an FLASH, an RAM and an I/O module are integrated in the chip, and the chip is provided with a plurality of timers with input capture;
the carrier communication module adopts an FSK modulation mode and a half-duplex mode to communicate with an asynchronous serial port of the processor, and the processor reads data transmitted and received by the asynchronous serial port by using a DMA mode to realize data interaction with the control terminal of the station area;
further comprising: a plurality of LED work indicator lights;
the processor is also used for controlling the display content of the LED working indicator lamp according to the commutation instruction and updating the display state of the corresponding LED working indicator lamp; the processor performs self-checking operation in each preset cycle, and if the self-checking fails, an alarm instruction is sent out, and the intelligent commutation control device is locked;
the commutation control module includes: a commutation switch control circuit, an auxiliary power supply circuit;
the commutation switch control circuit is used for controlling the action of the electronic commutation switch; the auxiliary power supply circuit is used for providing excitation +24 power for the commutation control module, and comprises: an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, an inductor L, a diode D and a power chip U1;
the input end of the auxiliary power circuit is respectively connected with the first end of an eleventh resistor R11, the first end of a third capacitor C3 and a power chip U1 pin; the second end of the third capacitor C3, the four pins of the power chip U1, the second end of the fourteenth resistor R14, the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5 are respectively grounded;
the second end of the eleventh resistor R11 is respectively connected with the seventh pin of the power chip U1, the first end of the inductor L and the first end of the twelfth resistor R12;
the second end of the twelfth resistor R12 is connected with eight pins of the power chip U1; the second end of the inductor L is respectively connected with one pin of a power chip U1 and the anode of a diode D, and the cathode of the diode D is respectively connected with the first end of a thirteenth resistor R13, the first end of a fourth capacitor C4, the first end of a fifth capacitor C5 and the output end of an auxiliary power circuit;
the second pin of the power chip U1 is grounded, the third pin is grounded through a sixth capacitor C6, and the second end of a thirteenth resistor R13 is respectively connected with the fifth pin of the power chip U1 and the first end of a fourteenth resistor R14;
the commutation switch control circuit includes: a second operational amplifier U2, a third operational amplifier U3, a fourth operational amplifier U4, a fifth operational amplifier U5, a first triode Q1, a second triode Q2, a sixth resistor R6 and a seventh resistor R7;
the SET pin of the commutation switch control circuit is respectively connected with a pin of a second operational amplifier U2 and a pin of a fifth operational amplifier U5, the two pins of the second operational amplifier U2, the two pins of a third operational amplifier U3, the two pins of a fourth operational amplifier U4 and the two pins of a fifth operational amplifier U5 are respectively grounded, the three pins of the second operational amplifier U2 are respectively connected with the first end of a sixth resistor R6 and the base of a first triode Q1, the RST pin of the commutation switch control circuit is respectively connected with the one pin of a third operational amplifier U3 and the one pin of a fourth operational amplifier U4, the three pins of the third operational amplifier U3 are respectively connected with the collector of a first triode Q1 and the OUT + of the commutation switch control circuit, the three pins of the fifth operational amplifier U5 are respectively connected with the collector of a second triode Q2 and the OUT-of the commutation switch control circuit, the base of the fourth operational amplifier U4 is respectively connected with the first end of a seventh resistor R356, the base of the sixth resistor R3527 and the base of the sixth resistor R7, the sixth end of the triode Q6, the resistor R7 and the base of the, An emitter of the first triode Q1 and an emitter of the second triode Q2 are respectively connected with a +24 power supply;
the device further comprises: the terminal voltage measuring module of the electronic switching element contact;
the electronic switch element terminal voltage measuring module is used for detecting the voltage before and after phase commutation of each phase in the electronic phase commutation switch and transmitting the detected voltage signal to the processor;
the method comprises the following steps:
the intelligent commutation control device executes initialization operation after being powered on or reset, reads the edge signal of the frequency measurement square wave to calculate the real-time frequency, and synchronously adjusts the sampling interval; calculating three-phase voltage, load current amplitude and phase by adopting a half-wave Fourier transform algorithm, realizing measurement display and communication remote transmission functions, and simultaneously realizing overvoltage, undervoltage and overcurrent protection functions;
after receiving a phase change instruction sent by a transformer area control terminal, the intelligent phase change control device samples waveforms according to the voltage and current of the transformer area three-phase power,
judging a first zero crossing point of the current after receiving the commutation instruction through a timer arranged in the processor, pre-judging the occurrence time of a second zero crossing point according to the frequency, pre-sending a switching instruction by the intelligent commutation control device according to the inherent action time of the commutation switch, and instantaneously disconnecting the load when the current crosses the zero crossing point;
and after the phase change action is finished, the phase change result is uploaded through the carrier communication module.
2. The commutation control method for an intelligent commutation control device according to claim 1,
the initialization operation includes sampling data initialization, communication data initialization, IO port initialization, AD sampling initialization,
after the initialization operation, the method further comprises the following steps: the intelligent commutation control device carries out self-checking operation, reads a frequency measurement square wave edge signal after the self-checking is successful, and calculates the real-time frequency;
and the processor of the intelligent commutation control device runs self-checking operation in each preset cycle, and sends out an alarm instruction if the self-checking fails and locks the electronic commutation switch.
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| CN109004660B (en) * | 2018-07-23 | 2023-10-20 | 深圳市粤能电气有限公司 | Intelligent load distributor for intelligent camera changing mechanism |
| DE102018214747A1 (en) * | 2018-08-30 | 2020-03-05 | Siemens Aktiengesellschaft | Device for a low-voltage circuit |
| CN109560526A (en) * | 2018-09-19 | 2019-04-02 | 广东电网有限责任公司 | A kind of power distribution station outlet branch line switching current alarm device |
| CN108900009B (en) * | 2018-09-19 | 2024-10-01 | 广东电网有限责任公司 | Tripping alarm device for outgoing line branch switch of power distribution station |
| CN110266025A (en) * | 2019-07-03 | 2019-09-20 | 青岛鼎信通讯股份有限公司 | A kind of three-phase intelligent phase-change switch device and control method optimizing switch topology |
| CN110825151B (en) * | 2019-11-26 | 2024-09-24 | 厦门亿联网络技术股份有限公司 | High-Side acquisition mode circuit device based on low-voltage current acquisition chip |
| CN112018789B (en) * | 2020-08-28 | 2023-01-20 | 广东电网有限责任公司广州供电局 | Three-phase unbalanced self-adaptive phase-changing system |
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| US9385638B2 (en) * | 2014-10-30 | 2016-07-05 | Eaton Corporation | Regenerative rectifier for a motor control drive |
| CN205149196U (en) * | 2015-12-08 | 2016-04-13 | 青岛市贤俊龙彩印有限公司 | A disconnected paper detection control circuit for printing machine |
| CN105914763B (en) * | 2016-05-23 | 2019-01-25 | 江苏首捷智能设备有限公司 | A kind of novel intelligent phase-change switch and method for power distribution station |
| CN206180873U (en) * | 2016-11-28 | 2017-05-17 | 上海希形科技有限公司 | Program control instrument circuit is criticized to electricity |
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